b+bq=5
b/(1-q)=5,2
b=5/(1+q)
b=5,2(1-q)
5/(1+q)=5,2(1-q) 5=5,2*(1-q^2) 1-q^2=5/5,2
q^2=1-5/5,2
q=√1/26
b+bq=5
b/(1-q)=5,2
b=5/(1+q)
b=5,2(1-q)
5/(1+q)=5,2(1-q) 5=5,2*(1-q^2) 1-q^2=5/5,2
q^2=1-5/5,2
q=√1/26